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While most Americans get sufficient L-lysine from their diet, specific populations like vegans, older adults, and athletes may consider supplementation. As an essential amino acid, L-lysine is crucial for protein synthesis, tissue repair, and immune function, but understanding the safety and proper use of supplements is vital before starting.

L-lysine is an essential amino acid, meaning the human body cannot synthesize it on its own and must obtain it through dietary sources. This vital compound plays a crucial role in many biological functions, including protein synthesis, hormone production, and immune support, demonstrating its importance for overall health.

Lysine is one of nine essential amino acids that the body cannot produce on its own and must obtain from diet or supplementation. L-Lysine HCI is a common supplemental form of this critical nutrient, used for a variety of health purposes, from boosting the immune system to aiding in calcium absorption.